Pressure Mounts for DuPont Breakup

DuPont Co., the chemicals conglomerate, is facing increasing pressure from analysts and investors to sell off or spin out the agricultural portion of its business, which has been generating most of its growth.

Such a move would go further than the strategy DuPont has been considering. As activist investor Nelson Peltz took a stake in the company, DuPont Chief Executive Ellen Kullman floated the idea of jettisoning a smaller division...